Oracle Instance - Oracle Instance contains one or more system components *( HTTP Server, WebCache, Oracle Internet Directory). Oracle Instance Directory contains updatable files like configuration files, log files. Oracle Instance directory is different from Oracle Home Directory and can reside inside or outside Middleware Home.

WebLogic Server- is J2EE application Server in Fusion Middleware 11g.

OPMN- Oracle Process Manager and Notification Server is management & notification server for system components like HTTP Server, OID, WebCache.

opmnctl - is utility to start/stop and manage system components in Fusion Middleware 11g. From Fusion Middleware 11g, opmnctl command exists in two places ; $ORACLE_HOME/opmn/bin and $ORACLE_INSTANCE/bin

Why to integrate Oracle Instance with WebLogic Server Domain ? - If you wish to manage system components (like HTTP Server, OID, Webcache) using Fusion Middleware Control Console (/em) then register ORACLE_INSTANCE with Weblogic Server Domain.

How to register Oracle Instance with WebLogic Server Domain  ? - use opmnctl from INSTANCE_HOME to register Oracle Instance with WebLogic Server. Ex

$INSTANCE_HOME/bin/opmnctl registerinstance -adminHost myhostname -adminPort 7001

*Fusion Middleware provides two type of system component Java Component & System component

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